header {
  height: 100px;
  background: rgb(65, 5, 62);
  display: flex;
}

.react {
  width: 200px;
  height: 200px;
  float: left;
  margin-right: 20px;
  background: url('../img/react.png');
  background-size: cover;
}
.vue {
  width: 200px;
  height: 200px;
  float: left;
  background: url('../img/vue.png');
  background-size: cover;
  /* CSS3样式 */
  transform: translateX(100px);
}